Abstract
Mathematical modeling and carefully controlled laboratory experiments are used to quantify the relationships among nitrifying and heterotrophic bacteria and the key constituents of effluent quality. Mathematical model results are used to interpret experimentally measured traditional parameters, such as soluble chemical oxygen demand (COD) and total biomass. Although total biomass declines with a decrease in influent COD loading, soluble effluent quality remains nearly the same because the effluent soluble COD is controlled by biomass-associated products. Increases in ammonia-nitrogen (NH+ 4-N) loading result in increases in nitrifier biomass, and the active heterotrophs also increase as a result of formation of soluble microbial products (SMP) by autotrophic nitrifiers. However, increased NH+ 4-N loading causes a steady increase in effluent soluble COD, indicating that the SMP production by nitrifiers is only partially used by the heterotrophs. During the nonsteady-state period after a loading change, nitrification responds more slowly than heterotrophic processes and controls the time needed to reach the new steady state.
| Original language | English (US) |
|---|---|
| Pages (from-to) | 566-573 |
| Number of pages | 8 |
| Journal | Water Environment Research |
| Volume | 72 |
| Issue number | 5 |
| State | Published - Sep 2000 |
| Externally published | Yes |
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Keywords
- Biomass
- Denitrification
- Mathematical modeling
- Nitrification
- Solids retention time
- Soluble chemical oxygen demand
- Soluble microbial products
ASJC Scopus subject areas
- Aquatic Science
- Environmental Science(all)
- Environmental Chemistry
- Environmental Engineering
- Water Science and Technology
Cite this
Interpreting the Response to Loading Changes in a Mixed-Culture Completely Stirred Tank Reactor. / Viraj De Silva, D. G.; Rittmann, Bruce.
In: Water Environment Research, Vol. 72, No. 5, 09.2000, p. 566-573.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interpreting the Response to Loading Changes in a Mixed-Culture Completely Stirred Tank Reactor
AU - Viraj De Silva, D. G.
AU - Rittmann, Bruce
PY - 2000/9
Y1 - 2000/9
N2 - Mathematical modeling and carefully controlled laboratory experiments are used to quantify the relationships among nitrifying and heterotrophic bacteria and the key constituents of effluent quality. Mathematical model results are used to interpret experimentally measured traditional parameters, such as soluble chemical oxygen demand (COD) and total biomass. Although total biomass declines with a decrease in influent COD loading, soluble effluent quality remains nearly the same because the effluent soluble COD is controlled by biomass-associated products. Increases in ammonia-nitrogen (NH+ 4-N) loading result in increases in nitrifier biomass, and the active heterotrophs also increase as a result of formation of soluble microbial products (SMP) by autotrophic nitrifiers. However, increased NH+ 4-N loading causes a steady increase in effluent soluble COD, indicating that the SMP production by nitrifiers is only partially used by the heterotrophs. During the nonsteady-state period after a loading change, nitrification responds more slowly than heterotrophic processes and controls the time needed to reach the new steady state.
AB - Mathematical modeling and carefully controlled laboratory experiments are used to quantify the relationships among nitrifying and heterotrophic bacteria and the key constituents of effluent quality. Mathematical model results are used to interpret experimentally measured traditional parameters, such as soluble chemical oxygen demand (COD) and total biomass. Although total biomass declines with a decrease in influent COD loading, soluble effluent quality remains nearly the same because the effluent soluble COD is controlled by biomass-associated products. Increases in ammonia-nitrogen (NH+ 4-N) loading result in increases in nitrifier biomass, and the active heterotrophs also increase as a result of formation of soluble microbial products (SMP) by autotrophic nitrifiers. However, increased NH+ 4-N loading causes a steady increase in effluent soluble COD, indicating that the SMP production by nitrifiers is only partially used by the heterotrophs. During the nonsteady-state period after a loading change, nitrification responds more slowly than heterotrophic processes and controls the time needed to reach the new steady state.
KW - Biomass
KW - Denitrification
KW - Mathematical modeling
KW - Nitrification
KW - Solids retention time
KW - Soluble chemical oxygen demand
KW - Soluble microbial products
UR - http://www.scopus.com/inward/record.url?scp=0034271909&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=0034271909&partnerID=8YFLogxK
M3 - Article
AN - SCOPUS:0034271909
VL - 72
SP - 566
EP - 573
JO - Research Journal of the Water Pollution Control Federation
JF - Research Journal of the Water Pollution Control Federation
SN - 1061-4303
IS - 5
ER -